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Association and impact of patellofemoral dysplasia on patellofemoral arthropathy and arthroplasty.
[trochlear dysplasia]
The
association
of
patellar
and
trochlear
anomalies
resulting
in
isolated
patellofemoral
osteoarthritis
has
often
been
postulated
but
rarely
studied
.
The
purpose
of
this
study
was
to
examine
the
association
of
patellofemoral
dysplasia
,
specifically
trochlear
anomalies
,
which
are
a
cause
for
degenerative
disease
and
may
result
in
a
worse
outcome
after
arthroplasty
for
isolated
patellofemoral
arthritis
.
Eighteen
consecutive
patients
who
underwent
robotic
image-based
patellofemoral
arthroplasty
were
compared
with
an
age
and
sex-matched
group
of
patients
who
underwent
medial
unicompartmental
arthroplasty
using
the
same
image-based
navigation
system
and
had
no
patellofemoral
,
lateral
disease
or
malalignment
.
The
compared
parameters
were
the
patellofemoral-trochlear
angle
and
Dejour
score
in
the
preoperative
radiographs
and
patellofemoral-trochlear
angle
and
internal
rotation
of
the
trochlea
compared
to
the
intercondylar
line
in
the
proximal
,
middle
and
distal
trochlea
.
Significantly
higher
rates
of
patella
alta
(
T
=
5
,
P
=
0
.
0001
)
and
trochlear
dysplasia
(
6
%
vs
.
55
%
)
were
found
,
as
manifested
by
an
increase
in
the
trochlear
angle
and
Dejour
score
.
Furthermore
,
the
trochlea
was
found
to
have
a
higher
degree
of
internal
rotation
in
patients
with
isolated
patellofemoral
arthritis
compared
to
the
control
group
.
In
conclusion
,
patellofemoral
anomalies
such
as
patella
alta
and
trochlear
dysplasia
are
present
in
association
with
isolated
patellofemoral
arthritis
.
Isolated
patellofemoral
arthritis
is
also
associated
with
higher
rates
of
trochlear
internal
rotation
.
Correction
of
this
internal
rotation
is
essential
in
the
success
of
arthroplasty
in
patients
with
patellofemoral
disease
.
Level
III
study
,
It
is
a
case
control
study
.
Diseases
Validation
Diseases presenting
"isolated patellofemoral arthritis compared to the control group"
symptom
trochlear dysplasia
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